I’m having the same issue with the new Intel NUC Kit, they seem to have put in a different mainboard. The NUC’s manufactured in 01/14 worked flawless, while the newer series from 05/14 has some kinks (only accepts 1.35V RAM or 1333MHz 1.5V anything below and it doesn’t even start).
Anyway, they get stuck on “iPXE initialising devices…”. I’ve already tried every file from the /tftboot folder, no luck so far.
Maybe Mike has more luck.
P.S. I’m on 1.1.2